Classifications

• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
  • F16H—GEARING
  • F16H7/00—Gearings for conveying rotary motion by endless flexible members
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
  • F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
  • F02B67/00—Engines characterised by the arrangement of auxiliary apparatus not being otherwise provided for, e.g. the apparatus having different functions; Driving auxiliary apparatus from engines, not otherwise provided for
  • F02B67/04—Engines characterised by the arrangement of auxiliary apparatus not being otherwise provided for, e.g. the apparatus having different functions; Driving auxiliary apparatus from engines, not otherwise provided for of mechanically-driven auxiliary apparatus
  • F02B67/06—Engines characterised by the arrangement of auxiliary apparatus not being otherwise provided for, e.g. the apparatus having different functions; Driving auxiliary apparatus from engines, not otherwise provided for of mechanically-driven auxiliary apparatus driven by means of chains, belts, or like endless members
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
  • F16H—GEARING
  • F16H7/00—Gearings for conveying rotary motion by endless flexible members
  • F16H7/02—Gearings for conveying rotary motion by endless flexible members with belts; with V-belts
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
  • F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
  • F02B1/00—Engines characterised by fuel-air mixture compression
  • F02B1/02—Engines characterised by fuel-air mixture compression with positive ignition
  • F02B1/04—Engines characterised by fuel-air mixture compression with positive ignition with fuel-air mixture admission into cylinder
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
  • F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
  • F02B2275/00—Other engines, components or details, not provided for in other groups of this subclass
  • F02B2275/06—Endless member is a belt

Definitions

• the present invention relates to a belt transmission in an internal combustion engine for driving at least one accessory device according to what is indicated in greater detail in the introduction to attached Patent Claim 1.
• accessory devices for the engine, which devices are driven by the engine.
• these accessory devices can consist, for example, of a generator, an AC compressor, a cooling water pump and a steering servo pump.
• Driving of such accessory devices is usually brought about with the aid of a belt transmission at one end, usually a front end, of the engine, a belt pulley, which is connected firmly to the crankshaft of the engine, driving via one or more drive belts a belt pulley on each accessory device.
• drive transmissions for camshafts, a lubricating oil pump, any balancer shafts, any supercharging compressor and suchlike of the engine.
• These transmissions in the event that these accessory devices need to be synchronised with the crankshaft of the engine, are usually designed as gear- belt transmissions, chain transmissions or gearwheel transmissions.
• a further problem is that in the event that all accessory devices are driven by a single drive belt and this breaks, all drive to the remaining accessory devices also stops. Making use of a single drive belt also means that said drive belt is subjected to high stresses since it must in total transmit relatively great forces. Increased forces in the drive belt mean that correspondingly high forces come to act on the bearings and attachments of the accessory aggregates.
• the aim of the present invention is to make possible a solution for driving accessory devices on the flywheel of the engine, but which does not display the disadvantages which characterise known solutions.
• exchange and mounting of a new drive belt shall be able to be carried out without large parts of the transmission needing to be demounted or the drive belt needing to be of openable design.
• the drive belt can be arranged in a loop around the driving flywheel or belt pulley, without the drive belt needing to cross the axis of rotation of the latter on mounting.
• accessory devices can also be arranged at the rear end of the engine without difficulty.
• the number of accessory devices at the front end of the engine can be reduced with the consequence that the total axial extent of the engine and the accessory devices can be reduced.
• Figure 1 shows diagrammatically an internal combustion engine connected to the drive transmission of a vehicle
• Figure 2 shows diagrammatically an accessory device transmission on the flywheel of the engine.
• FIG 1 shows diagrammatically a multi-cylinder internal combustion engine 10, for example an Otto engine or a iesel engine, for a passenger car or other vehicle.
• the engine 10 comprises a crankshaft 11, at one end of which, in this case a front end, there is fixed a belt pulley 12 forming part of a belt transmission 13 for driving an accessory device 14 for the engine 10 and/or the vehicle.
• a belt pulley 12 forming part of a belt transmission 13 for driving an accessory device 14 for the engine 10 and/or the vehicle.
• All accessory devices can be driven by the same belt 15 or, alternatively, the belt pulley 12 of the crankshaft 11 can be designed with a number of different grooves, in which different separate drive belts fit for separate driving of the accessory devices.
• the accessory device can, for example, consist of a coolant pump for the engine 10, a steering servo pump for the vehicle, a coolant compressor for the air conditioning system of the vehicle, a generator for producing electrical energy in the vehicle or a supercharging compressor for the engine 10.
• the engine 10 is connected at its other, rear side to a drive transmission for driving the vehicle.
• the crankshaft 11 is connected at its rear end to a flywheel 16, to which there is fixed a friction clutch 17 which interacts with the flywheel 16.
• torque given off from the engine 10 is transmitted further to the driving wheels of the vehicle via a gearbox 18.
• Both the clutch 17 and the gearbox 18 which form part of the drive transmission consist of the usual type for vehicles and are therefore reproduced in simplified form in Figure 1.
• the flywheel 16 On its outer periphery, the flywheel 16 is designed on the one hand with a cylindrical part 19 with a smooth surface along its periphery and on the other hand with a gear ring 20 intended on starting to interact with a pinion 21 on a starter motor 22.
• Figure 1 shows the pinion 21 in engagement with the gear ring 20, as is the case during starting. After starting, the pinion 21 is brought out of this engagement in a manner which is conventional perse.
• Attached Figure 2 shows in greater detail but still only diagrammatically, in a view according to the cross-section 2-2 according to Figure 1, the belt transmission 23 on the flywheel 16.
• the accessory device 26 is shown in the form of a belt pulley for the driving of the flywheel.
• two freely rotatable belt pulleys 27, 28 forming part of deflection members which are used to deflect the drive belt 24 forming part of the transmission 23. All belt pulleys 26, 27, 28 rotate around axes of rotation which are parallel to one another and which are also parallel to the axis of rotation 31 of the flywheel 16.
• the drive belt 24 consists of a continuous, non-openable flat belt with a smooth inner surface 29 and a smooth outer surface 30.
• the drive belt 24 bears with its inner surface 29 against the three belt pulleys 26, 27, 28, while its outer surface 30 bears against the smooth part of the flywheel 16, which in this connection consists of a belt pulley integrated with the flywheel 16.
• Both the deflection members 27, 28 have the task of ensuring contact of the belt 24 against the flywheel 16.
• the belt 24 should bear against the flywheel 16 along a sector angle a of between 120 and 180 degrees. The greater the contact angle a, the more reliable the driving and an angle a of around 180 is thus most advantageous.
• the angle a indicated of 120 degrees thus corresponds to a suitable lower limit.
• Both the deflection members 27, 28 are fixed directly to the engine 10 or indirectly via a bracket or suchlike.
• the accessory device 26 also is fixed in similar manner.
• the tensioning arrangement is expediently designed as a tensioning arrangement which is conventional for belt transmissions.
• the belt transmission 23 according to the invention at the rear end of the engine 10 means that a space not previously used can be used for driving accessory devices. This means that the previous problem of finding room for a number of accessory devices at the front end of the engine 10 can be avoided or at least reduced.
• the drive belt 24 is arranged in a deflected manner so that the axis of rotation 31 of the flywheel 16 lies outside the area 32 which is enclosed by the drive belt 24, exchange of the drive belt 24 in a simple manner is made possible. This is dependent on the fact that the drive belt 24 does not need to cross the axis of rotation 31 of the flywheel 16 on mounting.
• the crankshaft 11 of the engine 10, the clutch 17 and the gearbox 18 form units which are interconnected in a manner which does not allow a drive belt to be simply guided over the same.
• Which of the accessory devices given as examples in the introduction are to be arranged on the front side or rear side respectively of the engine 10 can in principle be chosen freely according to requirement.
• an accessory device which needs to be driven with a relatively high speed of rotation can be placed at the rear side of the engine 10.
• the flywheel 16 usually has a diameter which is considerably greater than the belt pulley 12 which is fixed at the front end of the crankshaft 1 1 , which means that a great ratio can be obtained between the flywheel 16 and the accessory device 26.
• the invention can be modified and designed other than exemplified in the description.
• a V-belt with a smooth outside and a conical inside can be used instead of a flat drive belt 24 .
• the belt pulleys 26, 27, 28 can be designed with usual V-shaped grooves, while the smooth outside of the belt bears against the smooth surface 19 of the flywheel 16.
• one or both of the deflection arrangements 27, 28 can advantageously be replaced by this accessory device or these accessory devices.
• a conventional flywheel 16 is described, which is adapted to be integrated into a belt transmission. This is advantageous since it means that the same flywheel 16 can be used irrespective of whether or not a belt transmission 23 is arranged at the rear end of the engine 10.
• the flywheel 16 can also be adapted and designed in other ways for the belt transmission, for example, by designing it with grooves or suchlike. It is also possible to use a separate belt pulley which is firmly mounted directly onto and forms a unit with the flywheel.

Landscapes

• Engineering & Computer Science (AREA)
• General Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• Chemical & Material Sciences (AREA)
• Combustion & Propulsion (AREA)
• Auxiliary Drives, Propulsion Controls, And Safety Devices (AREA)
• Devices For Conveying Motion By Means Of Endless Flexible Members (AREA)
• Arrangement Of Transmissions (AREA)

Applications Claiming Priority (3)

Publications (2)

Family

ID=20379015

Family Applications (1)

Country Status (6)

Families Citing this family (4)

Family Cites Families (8)

• 1990
  • 1990-03-28 SE SE9001118A patent/SE466142B/sv not_active IP Right Cessation
• 1991
  • 1991-03-27 JP JP91507070A patent/JPH05505988A/ja active Pending
  • 1991-03-27 US US07/934,695 patent/US5281188A/en not_active Expired - Lifetime
  • 1991-03-27 EP EP91907608A patent/EP0522063B1/de not_active Expired - Lifetime
  • 1991-03-27 WO PCT/SE1991/000233 patent/WO1991014594A1/en active IP Right Grant
  • 1991-03-27 DE DE69104477T patent/DE69104477T2/de not_active Expired - Fee Related

Non-Patent Citations (1)

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